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tracing/boot: Add per-instance tracing_on option support

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Add per-instance tracing_on option, which will be useful with
traceon/traceoff event trigger actions. For example, if we
disable tracing_on by default and set traceon and traceoff on
a pair of events, we can trace functions between the pair of
events.

Link: https://lkml.kernel.org/r/159972811538.428528.2561315102284268611.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu 2020-09-10 17:55:15 +09:00 committed by Steven Rostedt (VMware)
parent 40d14da383
commit 8490db06f9
1 changed files with 10 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

10
kernel/trace/trace_boot.c
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@ -40,6 +40,16 @@ trace_boot_set_instance_options(struct trace_array *tr, struct xbc_node *node)
pr_err("Failed to set option: %s\n", buf);
}
p = xbc_node_find_value(node, "tracing_on", NULL);
if (p && *p != '\0') {
if (kstrtoul(p, 10, &v))
pr_err("Failed to set tracing on: %s\n", p);
if (v)
tracer_tracing_on(tr);
else
tracer_tracing_off(tr);
}
p = xbc_node_find_value(node, "trace_clock", NULL);
if (p && *p != '\0') {
if (tracing_set_clock(tr, p) < 0)